The most common and most likely answer to this crossword clue is the 10 letter word DOUBLETALK
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Buddy explains!

The straight part
We know that "gibberish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gibberish = doubletalk.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DOUBLETALK mean?
DOUBLETALK noun- Doublespeak.
- : Lies, especially in a formal political statement.
- Speech which combines English and English-sounding gibberish for humorous effect.
- A simple phonetic code with a regular infix that makes meaningful speech sound unintelligible.
- A situation when two people talk at the same time, causing overlapping audio signals.